[PATCH] D45722: [X86] Lowering SAD (sum of absolute differences) intrinsics to native IR (clang side)

[Craig Topper via Phabricator via cfe-commits]

craig.topper added inline comments.


================
Comment at: clang/lib/CodeGen/CGBuiltin.cpp:8431
+      CGF.Builder.CreateZExt(CGF.Builder.CreateShuffleVector(
+                                 AD, llvm::UndefValue::get(BTy), ShuffleMask),
+                             VTy);
----------------
You can just pass AD twice. You don't need to create an Undef value. It will get optimized later.


https://reviews.llvm.org/D45722